SM1212E433 Semtech, SM1212E433 Datasheet - Page 47

• Manufacturer Part Number: SM1212E433
• Description: RF Module For SX1212
• Manufacturer: Semtech
• Series: -r
• Type: Transceiver, ISMr

Specifications of SM1212E433

• Frequency: 433MHz
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• For Use With/related Products: SX1212E

Note that depending upon the application, some uC connections may not be needed:
In addition, DATA pin (unused in buffered mode) should be pulled-up to VDD through a 100 kΩ resistor.
Please refer to Table 13 for the SX1212’s pin configuration.
Table 22: Relevant Configuration Registers in Buffered Mode (data processing related only)
Tx Mode:
Rev 2 – June 18th, 2009
ADVANCED COMMUNICATIONS & SENSING
SYNCParam
IRQParam
MCParam
RXParam
IRQ_0: if none of the relevant IRQ sources are used. In this case, leave floating.
IRQ_1: if none of the relevant IRQ sources are used. In this case, leave floating.
MISO: if no read register access is needed and the chip is used in Tx mode only. In this case, pull up to VDD
through a 100 kΩ resistor.
Configure all data processing related registers listed below appropriately. In this example we assume Sync
word recognition is on and Fifo_fill_method=0.
Program Tx start condition and IRQs: Start Tx when FIFO is not empty (Tx_start_irq_0=1) and IRQ_1 mapped
to Tx_done (Tx_irq_1=1)
Go to Tx mode (and wait for Tx to be ready, see Figure 50)
5.4.5. uC Connections
5.4.6. Buffered Mode Example
Fifo_fill_method
Rx_stby_irq_0
Rx_stby_irq_1
Tx_start_irq_0
Data_mode_x
Sync_value
Fifo_thresh
Sync_size
Fifo_size
Tx_irq_1
Sync_tol
Fifo_fill
Figure 41: uC Connections in Buffered Mode
SX1212
NSS_CONFIG
NSS_DATA
Tx
X
X
X
X
X
IRQ_0
IRQ_1
MOSI
MISO
SCK
Rx
X
X
X
X
X
X
X
X
X
X
Page 47 of 77
Defines data operation mode ( Buffered)
Defines FIFO size
Defines FIFO threshold
Defines IRQ_0 source in Rx & Stby modes
Defines IRQ_1 source in Rx & Stby modes
Defines IRQ_1 source in Tx mode
Defines FIFO filling method
Controls FIFO filling status
Defines Tx start condition and IRQ_0 source
Defines Sync word size
Defines the error tolerance on Sync word detection
Defines Sync word value
uC
Description
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SX1212